Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX: 621

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-621 A Darien CT   829J PAETEC ITEL, LLC 920      
203-621 0 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 1 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 2 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 3 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 4 Darien CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2005-03-20   
203-621 5 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 6 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 7 Darien CT   829J PAETEC ITEL, LLC 920      
203-621 8 Darien CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2005-02-03   
203-621 9 Darien CT   829J PAETEC ITEL, LLC 920      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.